A deadly crash east of Newmarket this morning, according to police, appears to be alcohol related.
The two-car collision happened near Highway 48 and Davis Drive around six am.
OPP say police believe a northbound vehicle may have drifted into the southbound lanes of the highway and struck a southbound vehicle head-on.
An occupant in the southbound car was killed and the male driver of the northbound vehicle was taken to hospital with possibly life-threatening injuries.
Police say he is under arrest, though no formal charges have been laid.